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Re: [aspectj-users] exceptions in around advice 
Mark,

Unless you are catching the exception thrown by proceed()
(i.e. the join point execution), you don't need to do anything
specific. You also do not need around() to declare throwing
any exception. In other words, the propagation of exception
that you are seeking happens automatically.

Object around() : executionOfIOExceptionThrowingMethods()
                  || executionOfSQLExceptionThrowingMethods() {
    ... some crosscutting logic
    return proceed();
}

The issue become when an around advice does want to catch the
exception (very typical for transaction management, security
and so on kind of concerns), what does it do with that exception?

Object around() : executionOfIOExceptionThrowingMethods()
                  || executionOfSQLExceptionThrowingMethods() {
    try {
        ... some crosscutting logic
        return proceed();
    } catch(Exception ex) {
        // crosscutting logic to handle failures
        // *** Now what to do with the exception *** ?
    }
}

This is where you use the exception introduction pattern ("AspectJ
in Action" chapter 8). Bascially it says: Throw the caught exception
wrapped in a RuntimeException. It also provides a mechanism to 
restore back the thrown exception so that the caller gets back the
orginal checked exception.

-Ramnivas

--- "Volkmann, Mark" <Mark.Volkmann@xxxxxxxxxxxxx> wrote:
> I've got an around advice that I want to apply to methods that throw
> different types of exceptions.  If an exception is thrown in the
> actual
> method when I call proceed() then I want that exception to propagate
> back to
> the caller.  I can't say that advice throws java.lang.Exception
> because then
> callers would have to catch that instead of the specific kinds of
> exceptions
> that can really be thrown.  How can I get this to work?
> 
> 
>
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=====
Ramnivas Laddad
Author, AspectJ in Action
http://www.manning.com/laddad
http://www.amazon.com/exec/obidos/ASIN/1930110936

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